A light-guide member includes a light-incident surface formed at an end portion of the light-guide member in a first direction, a light-emitting surface that is elongated in the first direction and that includes first and second light-emitting regions, which cause light to be emitted in different directions in a first cross section that is perpendicular to the first direction, a common deflecting portion that deflects light from the light-incident surface and causes the light to be emitted from the first and second light-emitting regions to the outside, and first and second protruding portions each of which is located on one of two sides of the deflecting portion in the first cross section, the first and second protruding portions protruding in a direction away from the light-emitting surface with respect to the deflecting portion.

This light source unit includes a light source, a collimator lens, a support body, and an adhesive agent. The collimator lens is configured to collimate laser light emitted from the light source. In the support body, a first support portion configured to support the light source and a second support portion configured to support the collimator lens are integrally molded with each other by use of a synthetic resin. The adhesive agent is attached by a larger amount between the second support portion and a second face which is on an opposite side to a first face on the light source side of the collimator lens, than between the second support portion and the first face.

A plurality of light sources, an optical deflector including a rotational member configured to be rotational about an axis of rotation thereof, and a plurality of reflective members, are provided in a light scanning unit for an image forming apparatus. The optical deflector is arranged to deflect light incident obliquely from the plurality of light sources and the plurality of reflective members are arranged to reflect the light deflected by the optical deflector to a plurality of surfaces, which are to be scanned and correspond to the plurality of light sources, and arranged such that scan lines on opposite surfaces with respect to the axis of rotation of the optical deflector among the plurality of surfaces to be scanned are bent in the same direction.

This light source unit includes a light source, a collimator lens, a support body, and an adhesive agent. The collimator lens is configured to collimate laser light emitted from the light source. In the support body, a first support portion configured to support the light source and a second support portion configured to support the collimator lens are integrally molded with each other by use of a synthetic resin. The adhesive agent is attached by a larger amount between the second support portion and a second face which is on an opposite side to a first face on the light source side of the collimator lens, than between the second support portion and the first face.

An image reading device includes a visible light source to irradiate a document with a visible light beam, an infrared light source to irradiate the document with an infrared light beam, and multiple mirrors disposed in optical paths of the visible light beam and the infrared light beam from the document to an imaging device. The multiple mirrors include at least a mirror having a reflectance of 93% or more, at a reflection angle of 45, to a light beam having a wavelength range of 450 nm or more and 900 nm or less.

An image reading device includes: a first reading portion configured to read an image of a sheet; a second reading portion disposed below a contact glass; a first white reference plate disposed in a conveying portion to face the first reading portion; a second white reference plate disposed in the conveying portion at a reference position that can face the second reading portion; and a control portion configured to light a first light source and generate first white reference data by using reflected light reflected from the first white reference plate, and light a second light source and generate second white reference data by using reflected light reflected from the second white reference plate. The control portion controls the first light source and the second light source such that a lighting time of the first light source does not overlap with a lighting time of the second light source.

A reading device includes an image capturing element configured to capture a medium conveyed, a first roller disposed upstream of the image capturing element in a conveyance direction of the medium, and a second roller disposed downstream of the image capturing element in the conveyance direction, in which the image capturing element is disposed away from the medium and opposite to a first surface that is one surface of the medium, and the first roller and the second roller come into contact with the first surface of the medium from a side of the image capturing element to apply the medium with predetermined tension along the conveyance direction of the medium.

The image drawing apparatus includes a light source and a processor that controls operations of a first actuator and a second actuator to scan a surface with a light beam reflected by a reflecting surface. The processor estimates a scanning trajectory of the light beam on the surface to be scanned by using a first deflection angle estimation function that is a function of time for the first deflection angle and that takes into account a temporal variation of the first deflection angle depends on the second deflection angle, and a second deflection angle estimation function that is a function of time for the second deflection angle and that takes into account a temporal variation of the second deflection angle depends on the first deflection angle, and causes the light source to emit the light beam in correspondence with the estimated scanning trajectory and the image information.

A reading device includes a radiator radiating light, a light receiver receiving the light reflected from a target, a first optical path on which the light is reflected by a reflection surface to irradiate a surface of the target in a radiation area so that diffuse reflection light diffusely reflected by the surface of the target is guided to the light receiver as a read image, a second optical path on which the light is reflected by the reflection surface to irradiate the surface of the target in the radiation area so that regular reflection light regularly reflected by the surface of the target is guided to the light receiver as a read image, and a switcher switching the first optical path and the second optical path in a carriage that houses the radiator and the reflection surface and moves along a sub-scanning direction for image reading.